Expanding System Volume

I have 3 HD in RAID 5 setting to total 75 GB of HD space.
I have several volumes on it, including a dynamic system volume where my OS is installed.
I need to expand this volume so in disk management I try to expand it but I get this error:

"The selected volume was originally created on a basic disk and cannot be extended. Only volumes originally created on dynamic disks can be extended"

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Hi IlRoberto
This question is still open and needs to be closed. If any of the comments above helped you, please accept it as an answer. If not please send an update about your issue so that the question can be finalised. Thank you

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